Revealing mistake: Haley's pregnancy pad is visible when she raises her arms while lying on the table. (00:21:15)
The Fight for the Final - S1-E24
Revealing mistake: Wrong perspective during the Sawada-Hyuga play makes the chasing player from Maebashi look like he's 1 foot tall. (00:18:30)
Revealing mistake: Right after TJ and friends are looking at the "thermometers" of cans, the Ashleys have at least 4 crates of cans that they bring in on forklifts. However, the end result is 4,362 cans for the Ashleys. This may seem kind of picky, but I think there was more cans than 4,362.
One on One - S5-E7
Revealing mistake: When Coach Norris matches Mark's dunk in their game of HORSE, you can tell that she uses a trampoline or some other kind of apparatus that's off screen to assist her in her jump.